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annotate src/org/tmatesoft/hg/util/FileWalker.java @ 264:6bb5e7ed051a

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Optimize memory usage (reduce number of objects instantiated) when pooling file names and nodeids during manifest parsing
author Artem Tikhomirov <tikhomirov.artem@gmail.com>
date Fri, 19 Aug 2011 03:36:25 +0200
parents 1ec6b327a6ac
children ed6b74a58c66
rev   line source
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1 /*
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2 * Copyright (c) 2011 TMate Software Ltd
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3 *
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4 * This program is free software; you can redistribute it and/or modify
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5 * it under the terms of the GNU General Public License as published by
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6 * the Free Software Foundation; version 2 of the License.
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7 *
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8 * This program is distributed in the hope that it will be useful,
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9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 * GNU General Public License for more details.
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12 *
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13 * For information on how to redistribute this software under
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14 * the terms of a license other than GNU General Public License
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15 * contact TMate Software at support@hg4j.com
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16 */
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17 package org.tmatesoft.hg.util;
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19 import java.io.File;
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20 import java.util.LinkedList;
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21 import java.util.NoSuchElementException;
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23 /**
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24 *
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25 * @author Artem Tikhomirov
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26 * @author TMate Software Ltd.
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27 */
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28 public class FileWalker implements FileIterator {
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30 private final File startDir;
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31 private final Path.Source pathHelper;
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32 private final LinkedList<File> dirQueue;
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33 private final LinkedList<File> fileQueue;
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34 private final Path.Matcher scope;
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35 private File nextFile;
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36 private Path nextPath;
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37
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38 public FileWalker(File dir, Path.Source pathFactory) {
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39 this(dir, pathFactory, null);
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40 }
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41
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42 /**
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43 *
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44 * @param dir
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45 * @param pathFactory
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46 * @param scopeMatcher - this matcher shall be capable to tell not only files of interest, but
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47 * also whether directories shall be traversed or not (Paths it gets in {@link Path.Matcher#accept(Path)} may
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48 * point to directories)
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49 */
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50 public FileWalker(File dir, Path.Source pathFactory, Path.Matcher scopeMatcher) {
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51 startDir = dir;
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52 pathHelper = pathFactory;
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53 dirQueue = new LinkedList<File>();
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54 fileQueue = new LinkedList<File>();
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55 scope = scopeMatcher;
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56 reset();
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57 }
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59 public void reset() {
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60 fileQueue.clear();
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61 dirQueue.clear();
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62 dirQueue.add(startDir);
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63 nextFile = null;
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64 nextPath = null;
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65 }
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67 public boolean hasNext() {
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68 return fill();
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69 }
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71 public void next() {
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72 if (!fill()) {
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73 throw new NoSuchElementException();
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74 }
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75 nextFile = fileQueue.removeFirst();
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76 nextPath = pathHelper.path(nextFile.getPath());
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77 }
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79 public Path name() {
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80 return nextPath;
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81 }
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83 public File file() {
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84 return nextFile;
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85 }
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86
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87 public boolean inScope(Path file) {
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88 /* by default, no limits, all files are of interest */
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89 return scope == null ? true : scope.accept(file);
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90 }
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91
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92 // returns non-null
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93 private File[] listFiles(File f) {
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94 // in case we need to solve os-related file issues (mac with some encodings?)
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95 File[] rv = f.listFiles();
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96 // there are chances directory we query files for is missing (deleted), just treat it as empty
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97 return rv == null ? new File[0] : rv;
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98 }
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100 // return true when fill added any elements to fileQueue.
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101 private boolean fill() {
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102 while (fileQueue.isEmpty()) {
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103 if (dirQueue.isEmpty()) {
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104 return false;
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105 }
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106 while (!dirQueue.isEmpty()) {
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107 File dir = dirQueue.removeFirst();
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108 for (File f : listFiles(dir)) {
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109 final boolean isDir = f.isDirectory();
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110 Path path = pathHelper.path(isDir ? ensureTrailingSlash(f.getPath()) : f.getPath());
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111 if (!inScope(path)) {
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112 continue;
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113 }
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114 if (isDir) {
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115 if (!".hg/".equals(path.toString())) {
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116 dirQueue.addLast(f);
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117 }
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118 } else {
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119 fileQueue.addLast(f);
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120 }
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121 }
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122 break;
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123 }
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124 }
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125 return !fileQueue.isEmpty();
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126 }
229
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127
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128 private static String ensureTrailingSlash(String dirName) {
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129 if (dirName.length() > 0) {
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130 char last = dirName.charAt(dirName.length() - 1);
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131 if (last == '/' || last == File.separatorChar) {
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132 return dirName;
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133 }
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134 // if path already has platform-specific separator (which, BTW, it shall, according to File#getPath),
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135 // add similar, otherwise use our default.
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136 return dirName.indexOf(File.separatorChar) != -1 ? dirName.concat(File.separator) : dirName.concat("/");
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137 }
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138 return dirName;
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139 }
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140 }